Drill sharpening device



Sept. 5, 1950 J. ADRIAN DRILL SHARPENING DEVICE Filed Oct. 15, 1948 Patented Sept. 5, 1950 UNITED DRILL SHARPENING DEVICE Joseph Adrian, Cleveland, Ohio, assignor to Super Speed Printing Machinery, Inc., Cleveland, Ohio, a corporation of Ohio Application October 15, 1948, Serial No. 54,638

2 Claims. (Cl. 7682) without its being removed from the machine. r

Inasmuch as drills have to be sharpened frequently, considerable time is saved by the use of my invention since it becomes unnecessary to suspend operation of the machine for the purpose of removing and replacing the drills.

The device is intended for use especially with paper drilling machines wherein hollow drills are employed, and more especially with the paper drilling machine that constitutes the subject matter of my copending application Serial No. 52,019, filed September 30, 1948.

In the machine just referred to, provisions are made for manually rotating the drill in a particularly convenient manner; and, like most others of prevailing type, the machine incorporates a pressure plate for holding the work down against the work supporting table.

A primary object of my invention is to provide a simple and relatively inexpensive device of the aforesaid character that is highly efiicient; that is especially convenient of use, and by which the human element is practically entirely removed from the drill sharpening operation so far as pressure between drill and tool is concerned. According to my invention, the pressure of the tool upon the drill is substantially constant and uniform thereby to insure against roughness and irregularity of the cutting edge of the drill.

Another object of the invention is to provide a drill sharpening device composed of few parts that are so designed and related as to facilitate assembly and disassembly, and to expedite the removal and replacement of the sharpening tool when such becomes necessary.

A further object of the invention is to provide a drill sharpening device that is substantial and durable and practically immune from disorder.

The foregoing objects, with other and more limited ones hereinafter appearing, are attained in the embodiment of the invention illustrated in the accompanying drawing wherein like reference characters designate like parts throughout the several views.

In the drawing, Fig. 1 is a fragmentary side elevational view of a paper drilling machine, including a part of the work supporting table whereon my improved drill sharpening device is positioned with the sharpening tool engaged by the drill and with the pressure plate of the machine bearing upon an abutment of the device; Fig. 2 is a perspective view of the device, and Fig. 3 is a vertical section through the same in the common plane of the axis of the tool carrying member and of the stop screw.

The drill sharpening device, designated gen- .erally by the reference numeral I, includes a body portion 2 that rises from a base 3, the support-engaging under surface 4 of which is flat and in a plane normal to the axis of the body portion 2. The base desirably is formed of two substantially semi-circular portions whose centers are coincident with the axis of the body portion '2. Rising from the base along one side of the body portion and extending a suitable distance thereabove is an abutment 5. The foregoing elements are desirably parts of an integral casting.

The body portion 2 has an axial cylindrical recess 8 that opens through the upper end of said portion and the bottom wall 9 of which is within the plane of the base 3. Slidable within the recess 8 is a cylindrical member l0. Axial sockets open through the opposite ends of the member ID, and connecting said sockets is an axial bore l3. The head of a drill sharpening tool [5 occupies the socket in the upper end of the member Ill while the shank l6 of said tool projects through the bore [3 into the socket in the lower end of said member. The tool is held against movement with respect to the member by a set screw I1 that is threaded into a radial tapped hole in the member In.

- A helical spring II is compressed between the bottom wall 9 of the recess 8 and the opposed end wall of the socket in the lower end of the member I0, and. tends to retain the member 10 in elevated position with a shoulder 19 thereof in engagement with stop means 20, under which circumstances the upper end of the member ID is desirably flush with the corresponding end of I the body portion 2. The stop means 20 is prefer ,means 20, by projecting into. said groove, serves the double purpose of limiting the upward movement of the member Ill and holding said member against rotation with respect tothe body portion '2.

' Fig. 1 shows the drill sharpening device I in.

position on the work supporting table T of a drilling machine designated generally 'by the reference letter M. This machine is fully described in my aforesaid application, and includes 'a vertically movable head H by which a pressure plate P is yieldingly supported through a rod 1 that reciprocates within a vertical hollow boss h. The pressure plate is depressed by a spring 10 that 3 is compressed between the hub of said plate and the underside of the boss h.

D is a hollow drill, connected in the usual manner to a drill spindle k that is 'journaled in the head H and has a pulley h secured to its upper end. A belt h" extends about this pulley and one designated h on the upper end of the shaft h of a motor designated h that is carried by the head H. Also fixed to the motor shaft 'is a fly wheel 71.

The head H is guided for vertical movement on a. column C, and a so-called return spring S that surrounds said column tends to retain the head in elevated position. By suitable means, not shown herein but fully revealed in my former applica'tionabove referred to, the head 'is adapted :to be depressed'against the action of the spring S.

In theuse of the device, the pressure plate P'is "lifted and the device is placed upon the table '1' with the tool 15 approximately aligned with the =drill D. "Now, by the means referred to, the head His lowered to engage the hollow .drill D with the p-ointed'end of the tool. By a camming reaction between the drill and'tool (provided the parts are outof alignment), the device will be shifted until thetool is centered in the drill and, by continued =rnovemen't of the head, the tool and its carrying member it? will be depressed against the action 'of the spring H, but preferably only to a slight-degree as may be indicated by the distance the upper end of the member 1'0 is below the corresponding end of the body portion 2. The predetermined tension of the spring I l issuch as will produce a proper pressure ofthe toolon the drill when the member iii is depressed to the extent mentioned. In the positioning of the] device upon the table, the abutn1ent5 is located beneath the pressure plate P, and now with the tool properly aligned with the drill, the device maybe held in place upon the table by releasing the-pressure plate and allowing'it to -bear-on the abutment 5 under the full force of the spring 10 The operator may now'reach-over the tableof the machine and graspthe fly-wheel 71, and,-through thepreviouslydescribed driving connections, rotate :the spindle M and consequently the drill D relative to the stationary tool I5. A few turns o'fthe drill will be sufficient to-sharpen it, and s'incethe tool bears with constant pressure against the-'end-o'f the drill, the action of the tool upon thedrill willbe uniform throughout the circumference of the latter,-'thereby producing a smooth and =even cutting edge. After the drill'has been sharpened, itmay be retracted by'elevating the head 1H so as to lift the lower end-of the drill above "the point-of the tool it, after which the pressure plate may be raised and the device 1 removed "from the vmachine.

.As'shownin my application aforesaid, a guard encloses themachine :head and motor, together with :the driving connections between :the motor and'the drill spindle, etc., but said guard has an opening through which the fiy wheel h is readily accessible at all times.

Having thus described my invention, what I claim is:

1. A-drill sharpening device comprising a flat base, a body portion extending from the vbase with its axis normal to theplane thereof, said bodyiportionhaving an axial cylindrical recess that opensthroughits upper endand the bottom wall of which is approximately inthe plane of the .base, "a cylindrical member slidably fitting saidrecess, said member having axial sockets in its ends and an axial bore connecting said sockets,

a drill sharpening tool having a head that 00- cupiesthesocket in the exposed endrof said member and a shank that projects through the said bore, the member having a radially disposed threaded hole that opens into said bore, a set .screw threaded into said hole for engagement with the shank of the tool, a helical spring compressed'between the bottom wall of the recess and the end wall of the socket in the adjacent end of said'member, athreaded hole in the body portion in substantially parallel and closely spaced relation to the recess, the outer end of said hole being enlarged by a counterbore that opens through the end of the body portion remote from the base and'laterally through the adjacent wall of the recess, the contiguousportion of the aforesaid member containing a part .of said counterbore thereby to provide insaid member a longitudinal groove and a shoulder at "the bottom thereof, and a screw threaded into said hole of the body portion and having a head extending into said groove and overhanging said shoulder thereby to limit the longitudinal movement and prevent rotation of the member.

2. A drill sharpening device comprising a flat base characterized by two substantially semicircular sections-cf different radii andwith their centers substantially coincident, --a cylindrical body portion extending from the base with its axis normal to the plane thereof and inconcentric relation to said-sections, an abutment ex- "tending from the base alongsidesaid body "por tion and beyond the end of the latter remote from the base, saidbodypor-tion having an axial cylindrical recess that opens through its last mentioned end and -the' bottom wall of which is in the plane of the baseya cylindrical member slidably fitting said recess, said'anember having axial sockets in its ends andan axial bore connectingv said sockets, a drillsharpening tool 'having a-head that occupies the socket 'i-n-the exposed end-of said-memberand a'shan'k-t-hat pro- "jects through said bore, the member- 'having a --rad-iailly disposed threaded hole that opens into said bore,asetscrew threaded into said'hole for engagement w-iththe shankofthe tool-a helical spring compressed between the bottom wall of the recess and the end wall of the socket in the adjacent 'end -of said member, -a threaded --hole in the body portion in substantially parallel-and closely spaced relation to the recess, the outer end-of said hole being-enlarged by a counterbore that opens through the end of the body portion remote from the base and laterally through the adjacent wall of the recess, the contiguous portionof the aforesaid member containing ;a --part of said counterbore-thereby to provide 'insaid member a longitudinalgroove,anda shoulder at the-bottom thereof, and'a-screw ithrea'ded'into said hole and having a -head ex-tending into said groove and-overhangingsaid-shoulder"thereby'to limit longitudinal movement and prevent rotation of the member.

JOSEPH ADRIAN.

REFERENCES CITED The following references are of record vinthe file of this patent:

.UNITEDSTATES PATENTS Number :Name Date -1,9,l;1,714l ZBerry May 30, 1 .933 2,005,827 Lewis-ct a1 June $253935 

